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ST. CHARLES COUNTY, Mo. (KMOV.com) -- Police are searching for three suspects who allegedly cashed in fake $100 bills at Walgreens stores in St. Peters.

Authorities say the suspects start with a five dollar bill, then bleach and reprint it as a $100 bill. While the bill looks damaged, police say the fake currency "feels like money" and has a watermark.

Police say store surveillance video captured the crimes in progress.

"He hands over counterfeit 100 dollar bills, gets whatever minimal change back, leaves the store and gives those items to a female suspect, who then comes back in...who then returns those items to get full cash value back," said Officer Melissa Doss with the St. Peters Police Department.

Police say while surveillance video is helpful to the investigation, the footage is too grainy to identify the three suspects believed to be involved in the crimes.

"These videos are too grainy for police officers to make a case off of them alone," Doss said. "We need the public to come forward and say, 'I know that guy, he's my neighbor.'"

Secret Service agents told News 4 there is one reliable test for determining whether money is counterfeit. Real money has color-shifting ink, so it changes depending on the angle of the light. This type of ink is almost impossible to duplicate, and can be used to determine whether a bill is authentic U.S. currency.